Inspecting the Bendix Hydro-Max® Brake System
sb mm 42.07.001
Note: If possible, remove both caps when filling the reservoir. If only one cap can be removed, allow ample time for the reservoir to fill.
- Check the fluid level in the hydraulic brake fluid reservoir.
If needed, fill the reservoir up to the ridge that surrounds the reservoir.
See Fig.. Use only heavy-duty brake fluid, DOT 3.
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Open caps and check fluid level.
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Fill to this level.
Fig. 1, Hydraulic Brake Fluid Reservoir
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- Check all hydraulic lines and fittings for damage, leakage,
or looseness.Replace damaged or leaking components, and tighten loose fittings.
- Check the brake module for leaks. If leaks are found, repair or replace the brake module. See Chassis Plumbing Diagram of the Shuttle Bus Chassis Workshop Manual for replacement instructions, or take the vehicle to an authorized Freightliner dealer.
- Check the electrical connections and harnesses. Make sure the connectors are fully seated and the harnesses are not chafed or cut. Repair or replace any damaged harness. Disconnect any loose connectors and inspect the terminals for corrosion. If corrosion is present, replace the terminals. If corrosion is not present, reconnect the connector.
- Check the fuse for the hydraulic brake booster pump, as follows.
- Check the operation of the Hydro-Max brake booster, as
follows.
- With the ignition off, depress the brake pedal and listen for the back-up motor to engage. The operator should also feel the pedal force relieve and the pedal should depress easily.
- With the engine running and the parking brake released, ensure that the BRAKE warning indicator light is not on. This is a dual indicator, and indicates that the parking brake is set, and warns if there is a Hydro-Max failure condition other than loss of back-up motor power.
Note: